Telephone-insulator.



. R. W. ENGLISH! TELEPHONE INSULATOR.

APPLICATION FILED JUNE 30,1911.

1,266,435. Patented May14,1918.

gwouflo'r RN .Rnausa A UNITED STATES PATENT onmon 1 RQY WILFRED ENGLISH, OF VICTORIA, BRITISH COLUMBIA, CANADA;

TELEPHONE-INSULATOR.

To all/whom it may concern:

Be it known that I, ROY WILFRED ENG- LISH, a subject of the King of Great Britain, residing at Victoria, Province of British Columbia, Dominion of Canada, have invented new and useful Telephone-Insulators; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

The present invention relates to certain new and useful improvements in glass or porcelain insulators which are commonly used in connection with telegraph and tele phone wires, the object of the invention being to provide an insulator which embodies novel features of construction whereby the line wires can be securely gripped and engaged without the necessity of auxiliary tie members.

Further objects of the invention are to provide an insulator of this character which is comparatively simple and inexpensive in its construction, which is not liable to break and release the wire, which can be easily manipulated by unskilled laborers, and which will avoid the necessity of using wire ties, thereby bringing about a great saving in wire as well as overcoming the difiiculty which is incident to making a good tie.

With these and other objects in view, the invention consists in certain novel combinations and arrangements of the parts as will more fully appear as the description proceeds, the novel features thereof being pointed out in the appended claim.

For a full understanding of the invention, reference is to be had to the following description and accompanying drawings, in which Figure 1 is a side elevation of an insulator constructed in accordance with the invention.

Fig. 2 is a vertical sectional the same.

Fig. 3 is a top plan view of the bottom section of the insulator.

Fig. 4 is a bottom plan view of the top view through section of the insulator.

Fig. 5 is a fragmentary detail sectional view through one side of the insulator showing the manner in which the wire is clamped between the two sections and the upper section locked against rotation by the wire.

Corresponding'eand like parts are referred Specification of Letters Patent. Patefitgd 31 m 14, 1918, Application filed June 30, 1917. Serial No. 177,553. i

to in the following description and indicated in all the views of the drawings by the same reference characters.

Referring to the drawings, which illustrate one embodiment of the invention, the numeral ldesignates the usual wooden stem for the support of the insulator, the upper end of the stem being tapered and threaded in the usual manner, as indicated at 1*. The insulator itself is formed in two complemental sections A and B, the lower section B being in the form of a glass sleeve which is permanently fitted upon the stem 1. The lower end of the sleeve B is formed with a skirt 2 for shedding rain and moisture and preventing short circuiting through the wet stem 1 in rainy weather, while the upper end of the sleeve is dished at 3 and provided with a series of wire receiving grooves 4. In the present instance there are six of these wire receivin grooves 4, said grooves being arranged in t e form of two intersecting triangle in the well-known manner to form a six pointed star and with this arrangement it will be obvious that there will never be any difficulty in bringing one of the grooves into proper position to receive a line wire.

e upper complemental section A is in the form of a cap which is threaded upon the extremity of the wooden stem 1 and adapted to be screwed toward and away from the lower section B. The lower end of the cap A has a convex formation, as indicated at 5, so as to be received within the dished upper end 3 of the sleeve Band cooperate with the sleeve to tightly grip and clamp the line wire. If desired, the convex surface 5 of the cap may be formed with a series of concentric annular ribs 5 which will operate to bite into and grip the line wire in a more positive manner. A depending annular lip 6 surrounds the lower edge of the cap A, being arranged to extend downwardly slightly below the upper end of the sleeve when the cap is screwed down into operative position. The edges of this lip will thus engage the wire to form crimps therein at the points where it enters and leaves the insulator, thereby rendering creepage of the wire practically impossible. If desired, the edges of the lip 6 may be formed with slight notches or depressions 6 for engagement with the line wire, which is indicated at G, to prevent accidental loosening and rotation of the cap A after-it has been screwed into position. An annular the necessity of using wire ties,

groove 7 surrounds the cap A immediately above the depending lip 6 and provides a means for-anchoring the dead ending at the end of a lead. Above the annular groove 7 the cap A is provided with an annular series of vertical ribs 8 which project outwardly and are fortheipurposeof enabling a firm grip to be obtained upon the cap by the hand of an operator when manipulating the same. The construction is such that the line wires can be tightly gripped without andthis will result in ,great economy, since it will not only save the wire which would be used "for the ties, but will alsoiavoid the 'necessity of using high priced skilled labor for making the "ties.

Having -thus described the invention What I claim as new and desire to secure by Letters Patent, is

An insulator including a threaded stem, an insulating sleeve fitted upon the stem lower end and formed with a dished upper end portion having wire receiving grooves therein, and a cooperating insulating cap screwed upon the stem and formed with a convex adapted to fit within the dished upper end of the sleeve and cooperate therewith to clamp a line wire within one of the grooves, the lower end of the cap being provided with an annular depending lip which overhangs the upper end of the sleeve to engage the line wire as it enters and leaves the insulator, said lip having notches in the edges thereof for engagement with the wire.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

ROY NILFRED ENGLISH.

lVitnesses:

FREDERICK GEORGE \Voons, HY. It. Torr-1AM.

'Gopies of this patent 'may'be obtained for'five cents each, by addressing the Commissioner of Patents, Washington, D. 0. 

